Two particles are fixed on an x axis. Particle 1 of charge q1=2.1x10-8 C at x=20.0 cm and particle 2 of charge q2= -4.0q1 at x=70 cm. At what...

Two particles are fixed on an x axis. Particle 1 of charge q1=2.1x10-8 C at x=20.0 cm andparticle 2 of charge q2= -4.0q1 at x=70 cm. At what coordinate (i.e., x value) on the axis isthe net electric field produced by the particles equal to zero?